Add xPortResetHeapMinimumEverFreeHeapSize to heap5 (#1191)

The same was added to heap 4 in this PR - https://github.com/FreeRTOS/FreeRTOS-Kernel/pull/1189.

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

portable/MemMang/heap_5.c

@@ -457,6 +457,12 @@ size_t xPortGetMinimumEverFreeHeapSize( void )
 }
 /*-----------------------------------------------------------*/
 
+void xPortResetHeapMinimumEverFreeHeapSize( void )
+{
+    xMinimumEverFreeBytesRemaining = xFreeBytesRemaining;
+}
+/*-----------------------------------------------------------*/
+
 void * pvPortCalloc( size_t xNum,
                      size_t xSize )
 {